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Lab Preparation of Ethane by Kolbe's electrolysis

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Kolbe's electrolysis is the electrolysis of salts of monocarboxylic acids that gives higher alkanes. This process is used in lab preparation of ethane.

2R-COONa +  2H2O (electrolysis)= R-R + 2CO2 + 2NaOH + He

At anode

2CH3COO- - 2e-2CH3COO 2CH3 + 2CO2

2CH3C2H6

At Cathode 

2Na+ + 2e-2Na

2Na + H2O⟶2NaOH